This PR modifies the examples of section "When to merge instruction locations" in [HowToUpdateDebugInfo](https://llvm.org/docs/HowToUpdateDebugInfo.html) according to [the discussion](https://discourse.llvm.org/t/debuginfo-merging-instruction-locations-of-hoisted-instructions/77357), revise one misleading counterexample and refining the description of hoisting identical instructions.
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